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WSL2-Linux-Kernel
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Kbuild fixes for v5.8 

- fix -gz=zlib compiler option test for CONFIG_DEBUG_INFO_COMPRESSED
 
  - improve cc-option in scripts/Kbuild.include to clean up temp files
 
  - improve cc-option in scripts/Kconfig.include for more reliable compile
    option test
 
  - do not copy modules.builtin by 'make install' because it would break
    existing systems
 
  - use 'userprogs' syntax for watch_queue sample
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Merge tag 'kbuild-fixes-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - fix -gz=zlib compiler option test for CONFIG_DEBUG_INFO_COMPRESSED

 - improve cc-option in scripts/Kbuild.include to clean up temp files

 - improve cc-option in scripts/Kconfig.include for more reliable
   compile option test

 - do not copy modules.builtin by 'make install' because it would break
   existing systems

 - use 'userprogs' syntax for watch_queue sample

* tag 'kbuild-fixes-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  samples: watch_queue: build sample program for target architecture
  Revert "Makefile: install modules.builtin even if CONFIG_MODULES=n"
  scripts: Fix typo in headers_install.sh
  kconfig: unify cc-option and as-option
  kbuild: improve cc-option to clean up all temporary files
  Makefile: Improve compressed debug info support detection
This commit is contained in:
Linus Torvalds 2020-06-21 12:44:52 -07:00
Родитель 7561393908 214377e9b7
Коммит be9160a90d
8 изменённых файлов: 18 добавлений и 34 удалений
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16
Makefile
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@ -828,7 +828,7 @@ endif
ifdef CONFIG_DEBUG_INFO_COMPRESSED
DEBUG_CFLAGS += -gz=zlib
KBUILD_AFLAGS += -Wa,--compress-debug-sections=zlib
KBUILD_AFLAGS += -gz=zlib
KBUILD_LDFLAGS += --compress-debug-sections=zlib
endif
@ -1336,16 +1336,6 @@ dt_binding_check: scripts_dtc
# ---------------------------------------------------------------------------
# Modules
# install modules.builtin regardless of CONFIG_MODULES
PHONY += _builtin_inst_
_builtin_inst_:
@mkdir -p $(MODLIB)/
@cp -f modules.builtin $(MODLIB)/
@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
PHONY += install
install: _builtin_inst_
ifdef CONFIG_MODULES
# By default, build modules as well
@ -1389,7 +1379,7 @@ PHONY += modules_install
modules_install: _modinst_ _modinst_post
PHONY += _modinst_
_modinst_: _builtin_inst_
_modinst_:
@rm -rf $(MODLIB)/kernel
@rm -f $(MODLIB)/source
@mkdir -p $(MODLIB)/kernel
@ -1399,6 +1389,8 @@ _modinst_: _builtin_inst_
ln -s $(CURDIR) $(MODLIB)/build ; \
fi
@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
@cp -f modules.builtin $(MODLIB)/
@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
# This depmod is only for convenience to give the initial

2
arch/arm64/Kconfig
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@ -1564,7 +1564,7 @@ config CC_HAS_SIGN_RETURN_ADDRESS
def_bool $(cc-option,-msign-return-address=all)
config AS_HAS_PAC
def_bool $(as-option,-Wa$(comma)-march=armv8.3-a)
def_bool $(cc-option,-Wa$(comma)-march=armv8.3-a)
config AS_HAS_CFI_NEGATE_RA_STATE
def_bool $(as-instr,.cfi_startproc\n.cfi_negate_ra_state\n.cfi_endproc\n)

1
lib/Kconfig.debug
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@ -229,7 +229,6 @@ config DEBUG_INFO_COMPRESSED
bool "Compressed debugging information"
depends on DEBUG_INFO
depends on $(cc-option,-gz=zlib)
depends on $(as-option,-Wa$(comma)--compress-debug-sections=zlib)
depends on $(ld-option,--compress-debug-sections=zlib)
help
Compress the debug information using zlib. Requires GCC 5.0+ or Clang

2
samples/Kconfig
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@ -211,7 +211,7 @@ config SAMPLE_WATCHDOG
config SAMPLE_WATCH_QUEUE
bool "Build example /dev/watch_queue notification consumer"
depends on HEADERS_INSTALL
depends on CC_CAN_LINK && HEADERS_INSTALL
help
Build example userspace program to use the new mount_notify(),
sb_notify() syscalls and the KEYCTL_WATCH_KEY keyctl() function.

10
samples/watch_queue/Makefile
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@ -1,7 +1,5 @@
# List of programs to build
hostprogs := watch_test
# SPDX-License-Identifier: GPL-2.0-only
userprogs := watch_test
always-y := $(userprogs)
# Tell kbuild to always build the programs
always-y := $(hostprogs)
HOSTCFLAGS_watch_test.o += -I$(objtree)/usr/include
userccflags += -I usr/include

11
scripts/Kbuild.include
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@ -86,20 +86,21 @@ cc-cross-prefix = $(firstword $(foreach c, $(1), \
$(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
# output directory for tests below
TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
# try-run
# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
# Exit code chooses option. "$$TMP" serves as a temporary file and is
# automatically cleaned up.
try-run = $(shell set -e; \
TMP="$(TMPOUT).$$$$.tmp"; \
TMPO="$(TMPOUT).$$$$.o"; \
TMP=$(TMPOUT)/tmp; \
TMPO=$(TMPOUT)/tmp.o; \
mkdir -p $(TMPOUT); \
trap "rm -rf $(TMPOUT)" EXIT; \
if ($(1)) >/dev/null 2>&1; \
then echo "$(2)"; \
else echo "$(3)"; \
fi; \
rm -f "$$TMP" "$$TMPO")
fi)
# as-option
# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)

8
scripts/Kconfig.include
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@ -25,18 +25,12 @@ failure = $(if-success,$(1),n,y)
# $(cc-option,<flag>)
# Return y if the compiler supports <flag>, n otherwise
cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /dev/null)
cc-option = $(success,mkdir .tmp_$$$$; trap "rm -rf .tmp_$$$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$$$/tmp.o)
# $(ld-option,<flag>)
# Return y if the linker supports <flag>, n otherwise
ld-option = $(success,$(LD) -v $(1))
# $(as-option,<flag>)
# /dev/zero is used as output instead of /dev/null as some assembler cribs when
# both input and output are same. Also both of them have same write behaviour so
# can be easily substituted.
as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero)
# $(as-instr,<instr>)
# Return y if the assembler supports <instr>, n otherwise
as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)

2
scripts/headers_install.sh
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@ -11,7 +11,7 @@ then
echo "asm/inline/volatile keywords."
echo
echo "INFILE: header file to operate on"
echo "OUTFILE: output file which the processed header is writen to"
echo "OUTFILE: output file which the processed header is written to"
exit 1
fi